[FLINK-37963] Fix potential NPE when triggering JobManager failover prematurely #4044
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This closes FLINK-37963.
Occasionally, test cases related to triggering JM failover might fail, with an NPE thrown when manipulating jobManagerLeaderServices (like https://github.com/apache/flink-cdc/actions/runs/15509047609/job/43667549280).
It is likely to be caused by uninitialised JobManagerService and could be circumvented by invoking
EmbeddedHaServices#getOrCreateJobManagerServicemanually.